RE: find allocated and used space for a table

From: Rajesh Dayal <Rajesh_at_ohitelecom.com>
Date: Mon, 11 Jun 2001 02:16:08 -0700
Message-ID: <F001.00323DD6.20010611015050@fatcity.com>

Hi,

The results from previous mail's query would differ( by 1) from following....

SELECT SUM(blocks) "Allocated Blocks"
FROM dba_extents
WHERE segment_name = '&&table_name'
/

The reason for this is that one block is reserved for the segment header. DBA_SEGMENTS.BLOCKS holds the total number of blocks allocated to the table. While DBA_TABLES.BLOCKS holds the total number of blocks allocated for data.

And yes, the DBMS_SPACE package would return same values as that from DBA_TABLES.

HTH more..
Rajesh
-----Original Message-----
Sent: Monday, June 11, 2001 11:56 AM
To: 'ORACLE-L_at_fatcity.com'

If you can afford to analyze the Table(for latest statistics) then ....

Analyze Table <tablename> compute statistics.
select blocks "Used Blocks" , blocks + empty_blocks "Allocated Blocks" from dba_tables where table_name = 'tablename';

hth,
Rajesh

-----Original Message-----
Sent: Monday, June 11, 2001 11:56 AM
To: Multiple recipients of list ORACLE-L

Hi,

How to find allocated and used space for a table?

I required it urgently

Regds

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Author: Rajesh Dayal
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